I have a set of brothers that are 18 months apart (2.5 and 4) and they fight like crazy. My own 2 boys are 16 months apart (now 6 and 7) and they have always had a great time fighting and still fight a lot.

The only other sibling set I have is a boy (almost 4) and a girl (9 months). They are too far apart in age to relate much to each other at this point so don't play together enough to do much fighting. Once the girl starts crawling and walking I'm sure they'll have their share of fights when she gets into his stuff though.

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